Emission Control Systems: Testing and Inspection

2ZR-FXE EMISSION CONTROL: EMISSION CONTROL SYSTEM: ON-VEHICLE INSPECTION

1. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS

(a) Visually check that the hoses, connections and gaskets have no cracks, leaks or damage.

NOTICE:
* Detachment or other problems with the engine oil dipstick, filler cap, ventilation hose or other components may cause the engine to run improperly.
* Air suction caused by disconnections, looseness or cracks in any part of the air induction system between the throttle body and cylinder head will cause an engine failure or engine malfunction.

If any defects are found, replace parts as necessary.

2. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM

(a) Connect the Techstream to the DLC3.

(b) Disconnect the fuel vapor feed hose from the vacuum switching valve assembly shown in the illustration.





(c) Put the engine in inspection mode Component Tests and General Diagnostics.

(d) Start the engine.

(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP Control.

(f) Check that vacuum occurs at the purge VSV port.

(g) If vacuum does not occur, check the following items.

HINT
* Purge VSV (for canister purge)
* Clogging in the fuel vapor feed hose connecting the intake manifold and purge VSV
* Voltage from the ECM PRG terminal Pinout Values and Diagnostic Parameters

(h) Exit Active Test mode and reconnect the fuel vapor feed hose.

(i) Enter the following menus: Powertrain / Engine and ECT / Data List / EVAP Purge VSV.

(j) Warm up the engine and drive the vehicle.

(k) Confirm that the purge valve opens.

If the result is not as specified, replace the purge VSV, wire harness or ECM.

3. CHECK FUEL TANK AND VENT LINE

(a) Disconnect the vent line tube from the canister.

(b) Connect the pressure gauge to the vent line tube.





Text in Illustration





(c) Apply 4 kPa (0.04 kgf/cm2, 0.6 psi) of pressure to the vent line of the fuel tank.

HINT
Perform this inspection with the fuel tank less than 90% full. When the fuel tank is full, the fuel fill check valve closes and the pressure is released through the 2 mm orifice. As a result, when the fuel tank cap is removed, the pressure does not decrease smoothly.

(d) Check that the fuel tank pressure is maintained for some time, and does not decrease immediately.

HINT
If the pressure decreases immediately, one of the following may apply:

* The fuel tank cap is not completely tightened.
* The fuel tank cap is damaged.
* Air is leaking from the vent line.
* The fuel tank is damaged.

(e) When the fuel tank cap is removed, check that the pressure is released smoothly.

HINT
If the pressure does not drop, replace the fuel tank assembly.

(f) Reconnect the vent line tube to the canister.

4. INSPECT AIR INLET LINE

(a) Disconnect the air line tube from the charcoal canister assembly.





Text in Illustration





(b) Check that air flows freely into the air line.

If air does not flow freely into the air line, repair or replace the air line tube.

(c) Reconnect the air line tube to the charcoal canister assembly.